I'm not sure if it's using this app though, as the image in Larry's photo is actually different. And if you compare the suspect image (in the middle, below) to the fake images, you'll notice it looks a lot less human than at first glance. More like ET. This could just be some distortion from the compression. Or it might even be a totally different method of faking.

It always annoys me and boggles my mind when people wish to jump to the most extraordinary conclusions when more mundane and run of the mill ones will suffice. I think it's just people really eager to prove the supernatural. Since they have blinders on, they don't want to take a step back to maybe figure out a less sensationalist explanation.

the only slightly odd thing if it is just the tree, is that the roof line doesn't continue.
if you take the head off the ghost, the bottom looks like a normal reflection. Of course the head doesn't really resemble a head if you take the body off.
I'm guessing the head is something inside the porch. (not a ghost something, a solid something)